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Repaired a Sinclair ZX-80 that has certainly seen better days

Sinclair ZX-80 that has certainly seen better days

Gallery of repair and cleaning:

This computer is arrived for a repair from a friend. The defect is the classic Black Screen of Death and also the PCB has certainly seen better days.

Defects found:

  • Short circuits.
  • Tracks interrupted or broken.
  • Tracks partially raised.
  • Jumpers with flying leads.
  • Some components are partially unsoldered and soldered to other components.

Repair:

  • Rebuild all the tracks interrupted or partially raised.
  • Arrangement of all components removed or partially unsoldered.
  • Removing flying jumpers
  • Replaced CPU Zilog Z80
  • Replaced a RAM 2114
  • Replaced a Multiplexer 74LS157
  • Replaced the ZX-81 Rom with a Eprom 2532 with programmed the ZX-80 Rom.

Mod:

  • Composite video output (simple version without Transistor). It was made only to make easiest the repair.
  1. igorstellar
    May 29th, 2014 at 15:03 | #1

    OTTIMO :)
    ora ti guardo le foto e cerco i componeti per il mio progetto di costruire uno ZX80 identico 1 a 1 :)

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